Edit /etc/ssh/sshd_config and set the parameter PAMAuthenticationViaKBDInt to yes
# To disable tunneled clear text passwords, change PasswordAuthentication to no.
# Use PAM via keyboard interactive method for authentication.
# Depending on the setup of pam.conf(4) this may allow tunneled clear text
# passwords even when PasswordAuthentication is set to no. This is dependent
# on what the individual modules request and is out of the control of sshd
# or the protocol.